Performance issue with work flows

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Windows

Hi,

I am having multiple work flows that keep on running for ever as they are called from a console application.

But, after some period of time i am getting 'memory out of exception' error. Do i need to remove those completed work flow instances from memory? How do i know whether the work flow instance is still in memory even after the task of work flow is completed?

I am asking this because i am creating four different workflow instances i.e. i am calling four different work flows. So i don't know how to remove the older instances from memory.

Please, can any one help me here?

Thanks
Praveen